EXOPLANETS

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Across
  1. 2. Region where conditions are “just right” for life
  2. 5. Cloud of gas and dust
  3. 7. Our home galaxy
  4. 8. layer of gases that surrounds a celestial body
  5. 9. Path of a planet around a star
  6. 10. System of billions of stars
  7. 13. Our planetary system
  8. 15. Possible biosignature gas produced by life
  9. 16. Star type where early exoplanets were found
  10. 18. Rocky planet like Earth
  11. 20. Gas that protects life from harmful UV radiation
Down
  1. 1. Rapidly rotating neutron star
  2. 3. Spread of light into wavelengths
  3. 4. where liquid water can exist
  4. 6. Method using red/blue shift to detect planets
  5. 11. Gas produced by organisms, possible biosignature
  6. 12. Force attracting masses
  7. 14. Massive luminous sphere of plasma
  8. 17. Exploding star
  9. 19. Planet outside our solar system